<div style="display: flex; flex-wrap: wrap; white-space: pre-wrap; align-items: center; "><img height="20" width="20" style="border-radius:50%; margin-right: 4px;" decoding="async" src="https://avatars.githubusercontent.com/u/50826859?s=20&v=4" /><strong>hlfan</strong> left a comment <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5998#issuecomment-2888280658">(openstreetmap/openstreetmap-website#5998)</a></div>
<p dir="auto">I think I've found the culprit:<br>
<a href="https://github.com/openstreetmap/openstreetmap-website/blob/32f23461fc37f93ba7fcddd901ed156d544c575e/app/assets/javascripts/heatmap.js#L23">https://github.com/openstreetmap/openstreetmap-website/blob/32f23461fc37f93ba7fcddd901ed156d544c575e/app/assets/javascripts/heatmap.js#L23</a><br>
getUTCDay is [0,6], weekInfo.firstDay is [1,7]</p>

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